Remove the saucepan from the heat. Add marshmallows, chocolate, walnuts and vanilla; stir until marshmallows and chocolate melt and the mixture is combined. Beat by hand for 1 minute.

Spread the fudge evenly in the prepared pan. Score into squares while warm. Cover and chill for 2 to 3 hours or until firm. Use foil to lift the firm fudge out of the pan; cut into squares. Store tightly covered in the refrigerator for up to 1 month.

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